/*
 * Copyright (C) 2019 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "SharedMemory.h"

#include "SharedBuffer.h"

namespace PurCFetcher {

using namespace PurCFetcher;

RefPtr<SharedMemory> SharedMemory::copyBuffer(const SharedBuffer& buffer)
{
    if (buffer.isEmpty())
        return nullptr;

    auto sharedMemory = allocate(buffer.size());
    if (!sharedMemory)
        return nullptr;

    char* const sharedMemoryPtr = reinterpret_cast<char*>(sharedMemory->data());
    size_t position = 0;
    while (buffer.size() > position) {
        auto data = buffer.getSomeData(position);
        auto result = memcpy(sharedMemoryPtr + position, data.data(), data.size());
        ASSERT_UNUSED(result, result == sharedMemoryPtr + position);
        position += data.size();
    }

    return sharedMemory;
}

} // namespace PurCFetcher
